I'd be thrilled if these circles are caused by aliens. I am afraid they are just some old boring glass defects. What is temper mark anyway? My car is still under warranty, can I have the windshield replaced if the mysterious circles are not caused by my own actions? They don't look good on my window.
I am going out for lunch now, should be able to snap a photo of it for your further diagnoses. Stay tuned...and thanks!